Re: 4 GHz!!!
46 idle doesn't sound too far off for 1.7V. That's about where mine was. You've gotta remember that you have those two heatmonger G80's in your loop, too. A lot of those guys you see over on xtremesystems don't have them in their loops.
No matter what kind of pump/rad you have, a CPU only loop will almost always outperform one that includes graphics/chipsets--especially when it includes both or two cards that run as hot as the G80s. This is a big reason why I'm planning on going with two separate loops on my next build. One for CPU, one for graphics.
i7-2700k @ 5.0 GHz
Nvidia GeForce 570 2.5GB Tri-SLI
Asus P67 WS Revolution (Tri-SLI)
OCZ Vertex SSD x 4 (Raid 5)
G.Skill 8GB DDR3 @ 1600MHz
PC Power & Cooling 950W PSU